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Understanding ancient tectonic settings through detrital zircon analysis

Barham, M. ; Kirkland, C.L. ; Handoko, A.D.

Earth and planetary science letters, 2022-04, Vol.583, p.117425, Article 117425 [Periódico revisado por pares]

Elsevier B.V

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  • Título:
    Understanding ancient tectonic settings through detrital zircon analysis
  • Autor: Barham, M. ; Kirkland, C.L. ; Handoko, A.D.
  • Assuntos: convergent ; divergent ; geodynamic ; passive margin ; U/Pb geochronology
  • É parte de: Earth and planetary science letters, 2022-04, Vol.583, p.117425, Article 117425
  • Descrição: The fertility and heterogeneity of source rocks play important roles in determining the age distribution of detrital zircon populations that accumulate in sedimentary basins. Detrital zircon samples in active convergent tectonic settings are typified by a dominance of well-defined young age modes associated with an arc/magmatic orogenic belt, while passive margins and extensional settings more commonly express dispersed polymodal age populations reflecting more extensive, geologically heterogeneous catchments and greater sediment recycling. Two newly defined metrics relating to (i) the temporal difference between the 10th and 50th percentiles of a detrital zircon age population, and (ii) a modified χ2-distribution analysis of age population modality and dispersion, provide a powerful means of distinguishing between geologically active convergent systems and divergent/passive margin basins. Importantly, this tool does not require knowledge of depositional age. This “age distribution fingerprint” is assessed in three distinct Cenozoic to Proterozoic case-studies to demonstrate the tectonic resolution of the approach and potential in refining views of basin evolution. The age distribution fingerprint offers the ability to characterize sediment routing histories and investigate tectonic settings since the onset of subduction related plate tectonics, even where stratigraphic constraints are lacking. •Detrital zircon population characteristics reflect geodynamic setting.•Convergent settings typified by a dominance of well-defined young age modes.•Passive margins/extensional settings typified by dispersed polymodal age populations.•Two novel metrics characterize age populations - 10th to 50th percentile and Chi2.•Approach can resolve tectonic setting regardless of depositional age information.
  • Editor: Elsevier B.V
  • Idioma: Inglês
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